Electric lock



(No Model.)

* J. ELDON.

BLEGTRIO LOOK.

l/Vi/E/V r09 HTTORNEY.

Patented Apr. 24,1894.

w/ TNESSES r'rn STATES PATENT Orrrcn,

JAMES ELDON, OF LOOK HAVEN, PENNSYLVANIA.

. ELECTRIC LOCK.

SPECIFICATION forming part of Letters Patent No. 518,667, dated April 24,1894.

Application filed October 31, 1892. Serial No. l50, 92- (N model-l To all whom it may concern.-

forth and described in the following specification, reference being had to the accompanying drawing.

The main objects of my invention are to prevent the opening of safes on railroad trains between stations, also that a number of safes in a city or town belonging to several companies, firms or individuals may be electrically locked and electrically opened, by a combination of electric terminals, from a common or central station, or storage battery, connected if desired with an alarm at each or any of the saidsafes, also by the use of this look placed on the inside of safe doors, the usual weakening of the doors is prevented, by avoiding the apertures necessary for keyways and combination shafts used for other locks, aswell as avoidingcuttingaway the solid material of doors for the insertion of locks.

My invention is also applicable and intended to be used on prison, hospital and other doors, where the safety and convenience 1t lnsures may be desired. To accomplish these objects, the nature of my invention requires an electric motor, under the control of an operated electric current, to move the bolt or bolts of a look forward and backward, the lock being firmly fastened to the inside of the door to be locked.

My invention, its movements and control will be better understood, by reference to the drawing attached.

The following is a description of my lock.

The accompanying drawing is a view of the entire lock, the covering or back part being removed, to expose the mechanism to full view.

The frame I I incloses the parts.

J J represent the bolts of thelock;

R R are rearward extensions of the bolts J J, rigidly connected by the cross-piece S S, with an opening in the latter to receive the angular nut G. The opening is so constructed that the nut may move easily forward and backward in it, but is of such shape and size as, to prevent the nut Gfrom turning therein.

A A is an electric motor with shaft F F,

having a screw, thread cut on the rear end thereof. The shaft passes through apertures of somewhat greater diameter, than the screw end of the shaft, one in the forward side of the frame making said opening and the other in the rear side of the frame. The nut G is so operated on said screw, in said opening in the cross piece S S, as to allow the armature to make several revolutions, without expending any. force to move said bolts forward or backward, in order to secure momentum, to aid the motor and screw, in moving the bolts J J, into or out of the places prepared to receive them, outside the lock.

The electric current is supplied to the motor by means of wires (not shown) attached to the binding posts 0 O D D. The wires leading from binding posts 0 (J into the lock, connect with the field magnets A A. The wires leading from D D into the lock,oonnect with brushes of the motor.

The operation and use of my lock are as follows z-Starting withthe bolts entirely within the lock, the nut G will be adjusted on the rear part of the shaft of the armature, so as to be in contact with the rear side of the open ing in the cross-piece S S. To move the bolts forward so as to lock, the electric current is so applied through the binding posts G G and D D to the motor A A, as to cause the armature to revolve in the right direction, so that the nut G is moved freely forward on the screw threaded shaft F F in saidopening, until the nut comes in contact with the forward side of the opening in cross-piece S S, when by the continued revolution of the shaft, by the power of the electric current and of the screw of the shaft, the frame R R S S, with the bolts J J attached are forced forward, the bolts pass into the apertures prepared for them outside the door to which the lock is fastened, and thus the door islocked as desired. To withdraw the bolts, or to unlock, the electric current is reversed, by means of a switch (not shown), causing the armature to revolve in the opposite direction, whereby the nut G is moved freely backward until it comes in contact with the rearward side of the frame, forming the openingfor it, in the crosspiece S S, when all the parts operate the same asin locking, except that they act in the reverse direction, the bolts are thereby withdrawn enii-61y into" the. 100

door is uudorwor 1111s S S, comes in contact wi t' amtal spri ng H; V

by which means the circuit ypm anelectric 7 battery is GIOSGQQHQMBIBC 'ric alarm or bell,

(not herein shown'ox desrib ,whex eby the operator is givenn'o'bi the l-t s JJiagl'e in the position he pm (36 1.1112411 electr I an" electricf jmctop 4 with aw screw'threa. I fitlie boltsllghawi A neCted by-the c 'Wil} operate the b0 

